diff --git a/README.md b/README.md
index c3a534b..0d68ad2 100644
--- a/README.md
+++ b/README.md
@@ -122,6 +122,10 @@ This is done via `pip install --editable .` in the environment file.
 Otherwise the source is not in the pythonpath and the tests cannot import it.
 It uses the `setup.py` with the `setup.cfg` config.
 The tests are run with `pytest` in the main directory.
+Test coverage can be calculated with the
+[coverage](https://coverage.readthedocs.io) module:
+`coverage run --source=src -m pytest`
+and shown with `coverage report` or `coverage html` afterwards.
 
 To create the documentation go to the `docs` directory: `cd docs` and run `make html`.
 Then under `docs/_build/html/index.html` you can view the created documentation.
diff --git a/environment.yml b/environment.yml
index 6e29fb8..9f1b3db 100644
--- a/environment.yml
+++ b/environment.yml
@@ -14,6 +14,7 @@ dependencies:
     - sphinx
     - SQLAlchemy-Utils>=0.31
     - SQLAlchemy>=1.0
+    - coverage
     - pip
     # packages to be installed via pip:
     - pip: